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| CMS-PAS-SMP-18-006 | ||
| Search for anomalous electroweak production of WW/WZ/ZZ boson pairs in association with two jets in proton-proton collisions at 13 TeV | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A search for anomalous electroweak production of WW, WZ, and ZZ boson pairs in association with two jets in proton-proton collisions at 13 TeV is reported. The data sample corresponds to an integrated luminosity of 35.9 fb$^{-1}$ collected with the CMS detector. Events are selected by requiring two jets with large rapidity separation and dijet mass, one or two leptons (electrons or muons), and a W or Z boson decaying hadronically. The hadronically decaying boson is reconstructed as one large-radius jet. Constraints on the structure of quartic vector boson interactions in the framework of dimension-8 effective field theory operators are reported. Stringent limits on parameters for the effective field theory operators S0, S1, M0, M1, M6, M7, T0, T1, and T2 are obtained. Constraints on charged Higgs boson production are also reported. | ||
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CDS record (PDF) ;
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These preliminary results are superseded in this paper, PLB 798 (2019)134985. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
VBS Feynman diagrams contributing to the EW induced production of events containing a hadronically decaying gauge boson (V), a W (left) or Z (right) boson decaying to leptons (electrons or muons), and two forward jets. New physics (represented by black circles) in the EW sector can modify the quartic gauge coupling. |
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Figure 1-a:
VBS Feynman diagrams contributing to the EW induced production of events containing a hadronically decaying gauge boson (V), a W (left) or Z (right) boson decaying to leptons (electrons or muons), and two forward jets. New physics (represented by black circles) in the EW sector can modify the quartic gauge coupling. |
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Figure 1-b:
VBS Feynman diagrams contributing to the EW induced production of events containing a hadronically decaying gauge boson (V), a W (left) or Z (right) boson decaying to leptons (electrons or muons), and two forward jets. New physics (represented by black circles) in the EW sector can modify the quartic gauge coupling. |
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Figure 2:
Examples of Feynman diagrams showing the production of singly (left) and doubly (right) charged Higgs bosons via VBF. |
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Figure 2-a:
Examples of Feynman diagrams showing the production of singly (left) and doubly (right) charged Higgs bosons via VBF. |
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Figure 2-b:
Examples of Feynman diagrams showing the production of singly (left) and doubly (right) charged Higgs bosons via VBF. |
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Figure 3:
Comparison between the fit results for the W+jets and Z+jets background processes and the data distributions of the $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right), respectively, in the sideband region. The fit uncertainty is shown as a shaded band. |
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Figure 3-a:
Comparison between the fit results for the W+jets and Z+jets background processes and the data distributions of the $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right), respectively, in the sideband region. The fit uncertainty is shown as a shaded band. |
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Figure 3-b:
Comparison between the fit results for the W+jets and Z+jets background processes and the data distributions of the $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right), respectively, in the sideband region. The fit uncertainty is shown as a shaded band. |
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Figure 4:
Distributions of $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right) in the signal region. The gray bands include uncertainties from the predicted yields. The histograms for other backgrounds include the contributions from SM QCD VV, top, W+jets, and Drell-Yan processes. The overflow is included in the last bin.The bottom inset in each figure shows the ratio of the number of events observed in data to that of the total background prediction. |
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Figure 4-a:
Distributions of $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right) in the signal region. The gray bands include uncertainties from the predicted yields. The histograms for other backgrounds include the contributions from SM QCD VV, top, W+jets, and Drell-Yan processes. The overflow is included in the last bin.The bottom inset in each figure shows the ratio of the number of events observed in data to that of the total background prediction. |
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Figure 4-b:
Distributions of $m_{\mathrm{WV}}$ (left) and $m_{\mathrm{ZV}}$ (right) in the signal region. The gray bands include uncertainties from the predicted yields. The histograms for other backgrounds include the contributions from SM QCD VV, top, W+jets, and Drell-Yan processes. The overflow is included in the last bin.The bottom inset in each figure shows the ratio of the number of events observed in data to that of the total background prediction. |
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Figure 5:
Expected and observed exclusion limits at 95% confidence level as a function of $m({\mathrm {H^{\pm}}})$ for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm}}}) \, \mathcal {B}({\mathrm {H^{\pm}}}\to {\mathrm {W}} {\mathrm {Z}})$ in the WV (top left) and ZV (top right) final states, for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm \pm}}}) \, \mathcal {B}({\mathrm {H^{\pm \pm}}}\to {\mathrm {W}} {\mathrm {W}})$ as a function of $m({\mathrm {H^{\pm \pm}}})$ (bottom left), and on the ratio of vacuum expectation values in the GM model (bottom right). The blue shaded area covers the theoretically not allowed parameter space [58]. |
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Figure 5-a:
Expected and observed exclusion limits at 95% confidence level as a function of $m({\mathrm {H^{\pm}}})$ for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm}}}) \, \mathcal {B}({\mathrm {H^{\pm}}}\to {\mathrm {W}} {\mathrm {Z}})$ in the WV (top left) and ZV (top right) final states, for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm \pm}}}) \, \mathcal {B}({\mathrm {H^{\pm \pm}}}\to {\mathrm {W}} {\mathrm {W}})$ as a function of $m({\mathrm {H^{\pm \pm}}})$ (bottom left), and on the ratio of vacuum expectation values in the GM model (bottom right). The blue shaded area covers the theoretically not allowed parameter space [58]. |
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Figure 5-b:
Expected and observed exclusion limits at 95% confidence level as a function of $m({\mathrm {H^{\pm}}})$ for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm}}}) \, \mathcal {B}({\mathrm {H^{\pm}}}\to {\mathrm {W}} {\mathrm {Z}})$ in the WV (top left) and ZV (top right) final states, for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm \pm}}}) \, \mathcal {B}({\mathrm {H^{\pm \pm}}}\to {\mathrm {W}} {\mathrm {W}})$ as a function of $m({\mathrm {H^{\pm \pm}}})$ (bottom left), and on the ratio of vacuum expectation values in the GM model (bottom right). The blue shaded area covers the theoretically not allowed parameter space [58]. |
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Figure 5-c:
Expected and observed exclusion limits at 95% confidence level as a function of $m({\mathrm {H^{\pm}}})$ for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm}}}) \, \mathcal {B}({\mathrm {H^{\pm}}}\to {\mathrm {W}} {\mathrm {Z}})$ in the WV (top left) and ZV (top right) final states, for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm \pm}}}) \, \mathcal {B}({\mathrm {H^{\pm \pm}}}\to {\mathrm {W}} {\mathrm {W}})$ as a function of $m({\mathrm {H^{\pm \pm}}})$ (bottom left), and on the ratio of vacuum expectation values in the GM model (bottom right). The blue shaded area covers the theoretically not allowed parameter space [58]. |
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Figure 5-d:
Expected and observed exclusion limits at 95% confidence level as a function of $m({\mathrm {H^{\pm}}})$ for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm}}}) \, \mathcal {B}({\mathrm {H^{\pm}}}\to {\mathrm {W}} {\mathrm {Z}})$ in the WV (top left) and ZV (top right) final states, for $\sigma _\mathrm {VBF}({\mathrm {H^{\pm \pm}}}) \, \mathcal {B}({\mathrm {H^{\pm \pm}}}\to {\mathrm {W}} {\mathrm {W}})$ as a function of $m({\mathrm {H^{\pm \pm}}})$ (bottom left), and on the ratio of vacuum expectation values in the GM model (bottom right). The blue shaded area covers the theoretically not allowed parameter space [58]. |
| Tables | |
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Table 1:
Relative systematic uncertainties in the estimated signal and background yields in units of percent. |
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Table 2:
Expected yields from various background processes in WV and ZV final states. The statistical and systematic uncertainties are shown. The AQGC signal yields are shown for two AQGC scenarios with $\mathrm {f}_{T2}/ \Lambda ^{4} = -0.5$ TeV$ ^{-4}$ and $\mathrm {f}_{T2}/ \Lambda ^{4} = -2.5$ TeV$ ^{-4}$ for the WV and ZV final states, respectively. The charged Higgs boson signal yields are also shown for values of $\mathrm {s}_{H}=$ 0.5 and $\mathrm {m}_{H_{5}}=$ 500 GeV. |
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Table 3:
Observed and expected 95% C.L. limits on the couplings of the quartic operators S0, S1, M0, M1, M6, M7, T0, T1, and T2 in WV and ZV final states. |
| Summary |
| A search for anomalous electroweak production of WW, WZ, and ZZ boson pairs in association with two jets in proton-proton collisions at 13 TeV is reported. The data sample corresponds to an integrated luminosity of 35.9 fb$^{-1}$ collected with the CMS detector in proton-proton collisions at $\sqrt{s} = $ 13 TeV. The hadronically decaying W/Z boson is reconstructed as one large-radius jet. Constraints on the quartic vector boson interactions in the framework of dimension-eight effective field theory operators are obtained. Stringent limits on the effective field theory operators S0, S1, M0, M1, M6, M7, T0, T1, and T2 are set. These are the first searches for anomalous electroweak production of WW, WZ, and ZZ boson pairs in WV and ZV final states at 13 TeV. The upper limits on charged Higgs boson production cross sections in the high mass region extend the previous results at the LHC. Stringent limits are obtained for charged Higgs boson production cross section. Limits in the $s_{\mathrm{H}}$-$m(5)$ plane for charged Higgs boson masses above 1 TeV are shown for the first time at the LHC. |
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